Luke Knox, a college football linebacker with an NFL tight end older brother Dawson, has died at age 22.
Knox played for Florida International University, where coach Mike MacIntyre announced his death on social media.
"Words cannot express the heartfelt sorrow we feel because of the passing of our teammate and friend, Luke Knox," MacIntyre wrote. "While I admired his passion for football, his genuine love for his family and teammates is what I will always remember."
Neither the school nor police have released a cause of death so far, and an autopsy will be performed.
Knox's former school Ole Miss, where he played for four years before recently transferring to FIU, also paid tribute to Knox online.
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